In industrial production activities，high⁃salt wastewater containing NaNO₃ is usually produced，which is a recyclable resource.The corresponding acids and bases of high salt wastewater can be prepared by bipolar membrane electrodialysis（BMED）.The technique is of great significance for the resource utilization of high⁃salt wastewater.In this experiment，a three⁃compartment bipolar membrane electrodialysis membrane stack configuration was used to simulate high⁃salt wastewater with NaNO₃ solution to prepare HNO₃ and NaOH.The experiment used energy consumption，current efficiency，and conversion rate as evaluation indexes.The effects of current density，the concentration of raw material solution，type and concentration of polar liquid，and initial concentration of acid⁃base chamber solution，on the preparation of acid⁃base by BMED were investigated.The results showed that when the current density was increased，an increase in the salt conversion rate and energy consumption could be observed.An increase in current efficiency and a decrease in energy consumption could be found as the concentration of raw material solution was increased.However，the concentration of raw material solution was too high，which would cause the current efficiency to decrease obviously.3%NaOH was best for polar solution.When the initial concentration of the acid⁃base chamber was increased，an increase in the salt conversion rate and a decrease in energy consumption could be observed.The parameters were optimized as follows：the operating voltage was 35 V，the operating current density was 700 A/m²，the initial concentration of the acid⁃base chamber was 0.05 mol/L，the raw material liquid was 12% sodium nitrate，and the polar liquid was 3%NaOH.Under these conditions，the concentration of base was 2.227 mol/L，the salt conversion rate was up to 93.42%，the current efficiency was 60.83%，and energy consumption was 3.23 kW·h/kg.The research results could provide a reference for the resource utilization of NaNO₃ high salt wastewater in industrial production.